| http://www.w3.org/ns/prov#value | - The units are operated in a ring configuration (which may not be the same as physical arrangement or interconnection of the units) based on their assigned logical number in order to provide a modular type of operation.); (2) there is no centralized control or monitor to administer the system, i.e. find lost tokens, determine which stations are active, provide an up-to-date directory, e.g. in which
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